Light-Induced Interfacial Dynamics Dramatically Improve the Photocurrent in Dye-Sensitized Solar Cells: An Electrolyte Effect

被引：9
作者：
Gao, Jiajia [1 ]
El-Zohry, Ahmed M. [2 ]
Trilaksana, Herri [3 ]
Gabrielsson, Erik [4 ]
Leandri, Valentina [1 ]
Ellis, Hanna [2 ]
D'Amario, Luca [2 ]
Safdari, Majid [1 ]
Gardner, James M. [1 ]
Andersson, Gunther [3 ]
Kloo, Lars [1 ]
机构：
[1] KTH Royal Inst Technol, Dept Chem, Div Appl Phys Chem, SE-10044 Stockholm, Sweden
[2] Uppsala Univ, Angstrom Lab, Dept Chem, Box 523, SE-75120 Uppsala, Sweden
[3] Flinders Univ S Australia, Flinders Ctr NanoScale Sci & Technol CNST, Adelaide, SA 5042, Australia
[4] Dyenamo AB, Greenhouse Labs, Tekn Ringen 38A, SE-11428 Stockholm, Sweden
来源：
ACS APPLIED MATERIALS & INTERFACES | 2018年 / 10卷 / 31期
基金：
瑞典研究理事会;
关键词：
dye-sensitized solar cells; electrolyte; interface; dynamics; light soaking; DIPOLE LAYERS; ORGANIC-DYES; ACID; INJECTION;
D O I：
10.1021/acsami.8b06897
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A significant increase in the photocurrent generation during light soaking for solar cells sensitized by the triphenylamine-based D-pi-A organic dyes (PD2 and LEG1) and mediated by cobalt bipyridine redox complexes has been observed and investigated. The crucial role of the electrolyte has been identified in the performance improvement. Control experiments based on a pretreatment strategy reveals TBP as the origin. The increase in the current and IPCE has been interpreted by the interfacial charge-transfer kinetics studies. A slow component in the injection kinetics was exposed for this system. This change explains the increase in the electron lifetime and collection efficiency. Photoelectron spectroscopic measurements show energy shifts at the dye/TiO2 interface, leading us to formulate a hypothesis with respect to an electrolyte induced dye reorganization at the surface.
引用
收藏
页码：26241 / 26247
页数：7
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